Speaker
Description
Dedicated to memory of B. A. Tulupov
Being proposed a decade ago, the semi-microscopic Particle-Hole Dispersive Optical Model (PHDOM) is proved to be useful and productive tool for describing main properties of various Giant Resonances (GRs) in medium-heavy-mass doubly-closed-shell nuclei (Refs. [1, 2] and references therein). In the present work, this model is implemented to a number of isoscalar multipole GRs in one-closed-shell nuclei 58Ni, 120Sn, and 142Nd. Main properties of an arbitrary GR include the following characteristics defined for a wide excitation-energy interval: the strength distributions, transition densities, and probabilities of direct one-nucleon decay. In evaluation of these characteristics within PHDOM, nucleon pairing in the open-shell subsystem might be neglected with acceptable accuracy (excluding some partial probabilities of direct one-nucleon decay). Directly following Ref. [1], we evaluate the characteristics and parameters of real main-tone isoscalar GRs, having multipolarity L = 0 – 3, and of L = 0, 2 overtones of respective real GRs in nuclei under consideration. The results are compared with available experimental data.
Special attention is paid to a comparison of calculated and experimental multipole strength functions of isoscalar GRs in a few one- and doubly-closed-shell nuclei. A reasonable agreement is obtained, except for L=2 isoscalar GR in 142Nd. The first observation of the overtone of the L=2 isoscalar GR in this nucleus is announced in Ref. [3]. A possible reason for the above-noted disagreement might be a choice of the overtone transition density and probing operator employed in Ref. [3] to deduce the overtone strength function from experimental cross sections of -particle inelastic scattering. Another choice is proposed within PHDOM [1].
- M. L. Gorelik, S. Shlomo, B. A. Tulupov, and M. H. Urin, Phys. Rev. C 108, 014328 (2023).
- V. I. Bondarenko, and M. H. Urin, M. H., Phys. Rev. C 109, 064610 (2024).
- M. Abdullah, S. Bagchi, M.N. Harakeh, H. Akimune, et al., Phys. Lett. B 855, 138852 (2024).
